Customizer won't load so I can't edit my background

I am trying to adjust my background image so that it remains stationary while viewers scroll down the page. I cannot attempt this because when I try to select appearance/background, the page won’t load.

Hi @darylscottphillips, the site you reference is using the Obsession theme and is not hosted here at WordPress.com. For self-hosted WordPress sites such as yours, I would suggest asking for help from the theme author directly or ask in the volunteer-based WordPress.org Themes and Templates forum.

@darylscottphillips, on the Premium themes, such as Avid, they can be purchased from us for use on WordPress.com sites, but we do not sell them for use on self-hosted WordPress installations. To purchase Premium themes, such as Avid by The Theme Foundry, self-hosted users purchase directly from the theme author.

To make the image you have in .body-content fixed (not scrolling with content) add the following CSS.